frontend/style.css

/* ============================================================================
   Whisper Transcribe — premium glassmorphism UI
   Light = sky / cyan family · Dark = warm amber family
   ========================================================================== */

/* ---- reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; }
img, svg { display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
summary { cursor: pointer; }
::selection { background: var(--accent); color: var(--accent-contrast); }

/* ---- theme tokens --------------------------------------------------------- */
:root {
  /* light (default) — sky / cyan */
  --bg-1: #eaf6fd;
  --bg-2: #d4ebf5;
  --bg-3: #c2ddec;
  --aurora-a: rgba(56, 189, 248, 0.55);
  --aurora-b: rgba(14, 165, 233, 0.40);
  --aurora-c: rgba(125, 211, 252, 0.45);

  --text: #102a36;
  --text-soft: #436073;
  --text-faint: #6b8696;

  --accent: #0ea5e9;
  --accent-2: #38bdf8;
  --accent-strong: #0284c7;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(14, 165, 233, 0.12);
  --accent-ring: rgba(14, 165, 233, 0.30);

  --card-bg: rgba(255, 255, 255, 0.62);
  --card-border: rgba(255, 255, 255, 0.75);
  --card-shadow: 0 18px 50px -16px rgba(13, 71, 95, 0.30);
  --inset-bg: rgba(255, 255, 255, 0.55);
  --inset-border: rgba(13, 71, 95, 0.12);

  --field-bg: rgba(255, 255, 255, 0.85);
  --field-border: rgba(13, 71, 95, 0.16);
  --track-off: rgba(13, 71, 95, 0.20);

  --danger: #e11d48;
  --danger-soft: rgba(225, 29, 72, 0.12);
  --ok: #059669;

  --blur: 22px;
  --radius: 20px;
  --radius-sm: 12px;
  --radius-xs: 9px;
  --t-fast: 140ms cubic-bezier(.2, .8, .3, 1);
  --t: 240ms cubic-bezier(.2, .8, .3, 1);
}

:root[data-theme="dark"] {
  --bg-1: #0b0a09;
  --bg-2: #14110d;
  --bg-3: #1c1813;
  --aurora-a: rgba(251, 191, 36, 0.30);
  --aurora-b: rgba(245, 158, 11, 0.24);
  --aurora-c: rgba(217, 119, 6, 0.22);

  --text: #f6f5f2;
  --text-soft: #c3bcb0;
  --text-faint: #8f897e;

  --accent: #fbbf24;
  --accent-2: #fcd34d;
  --accent-strong: #f59e0b;
  --accent-contrast: #2a1d05;
  --accent-soft: rgba(251, 191, 36, 0.14);
  --accent-ring: rgba(251, 191, 36, 0.32);

  --card-bg: rgba(28, 24, 19, 0.62);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-shadow: 0 20px 60px -18px rgba(0, 0, 0, 0.65);
  --inset-bg: rgba(255, 255, 255, 0.04);
  --inset-border: rgba(255, 255, 255, 0.08);

  --field-bg: rgba(255, 255, 255, 0.05);
  --field-border: rgba(255, 255, 255, 0.12);
  --track-off: rgba(255, 255, 255, 0.18);

  --danger: #fb7185;
  --danger-soft: rgba(251, 113, 133, 0.14);
  --ok: #34d399;
}

body {
  color: var(--text);
  background: linear-gradient(160deg, var(--bg-1), var(--bg-2) 55%, var(--bg-3));
  background-attachment: fixed;
  transition: background-color var(--t), color var(--t);
  overflow-x: hidden;
}

/* ---- animated background -------------------------------------------------- */
.aurora { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.aurora-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.85;
  will-change: transform;
}
.aurora-1 { width: 46vw; height: 46vw; left: -10vw; top: -12vw; background: var(--aurora-a); animation: drift1 24s ease-in-out infinite alternate; }
.aurora-2 { width: 40vw; height: 40vw; right: -12vw; top: 8vh; background: var(--aurora-b); animation: drift2 30s ease-in-out infinite alternate; }
.aurora-3 { width: 50vw; height: 50vw; left: 18vw; bottom: -22vw; background: var(--aurora-c); animation: drift3 28s ease-in-out infinite alternate; }
@keyframes drift1 { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(8vw, 6vh, 0) scale(1.15); } }
@keyframes drift2 { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(-6vw, 10vh, 0) scale(1.1); } }
@keyframes drift3 { from { transform: translate3d(0,0,0) scale(1.05); } to { transform: translate3d(-10vw, -8vh, 0) scale(0.95); } }

/* ---- page scaffold -------------------------------------------------------- */
.page { max-width: 1180px; margin: 0 auto; padding: 28px 24px 40px; }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 26px; }
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 46px; height: 46px; display: grid; place-items: center; flex: none;
  border-radius: 14px; color: var(--accent-contrast);
  background: linear-gradient(135deg, var(--accent-2), var(--accent-strong));
  box-shadow: 0 10px 24px -8px var(--accent-ring), inset 0 1px 0 rgba(255,255,255,.4);
}
.brand-mark .icon { width: 24px; height: 24px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-size: 1.18rem; font-weight: 700; letter-spacing: -0.01em; }
.brand-tag { font-size: 0.82rem; color: var(--text-soft); }

/* ---- layout grid ---------------------------------------------------------- */
.layout { display: grid; grid-template-columns: 1fr; gap: 22px; }
@media (min-width: 980px) { .layout { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: start; } }

/* ---- cards (glass) -------------------------------------------------------- */
.card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  padding: 26px;
}
.card::before { /* subtle top sheen */
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: linear-gradient(180deg, rgba(255,255,255,.18), transparent 30%);
}
:root[data-theme="dark"] .card::before { background: linear-gradient(180deg, rgba(255,255,255,.05), transparent 28%); }

.card-head { margin-bottom: 20px; }
.card-head h2 { display: flex; align-items: center; gap: 9px; font-size: 1.16rem; font-weight: 700; letter-spacing: -0.01em; }
.card-head .muted { margin-top: 4px; font-size: 0.88rem; }

/* ---- helpers -------------------------------------------------------------- */
.icon { width: 18px; height: 18px; flex: none; }
.icon.accent { color: var(--accent); }
.muted { color: var(--text-soft); }
.small { font-size: 0.82rem; }
.field-label { font-size: 0.86rem; font-weight: 600; color: var(--text); }
.hidden { display: none !important; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.link-like { color: var(--accent-strong); font-weight: 600; }

/* ---- buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 16px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-weight: 600; font-size: 0.92rem; cursor: pointer; text-decoration: none;
  transition: transform var(--t-fast), box-shadow var(--t), background var(--t), border-color var(--t), opacity var(--t);
  -webkit-user-select: none; user-select: none;
}
.btn .icon { width: 17px; height: 17px; }
.btn:active { transform: translateY(1px) scale(.995); }
.btn[disabled], .btn.is-busy { cursor: not-allowed; opacity: .7; }
.btn.block { width: 100%; }
.btn.tiny { padding: 6px 11px; font-size: 0.82rem; border-radius: var(--radius-xs); }

.btn.primary {
  color: var(--accent-contrast);
  background: linear-gradient(135deg, var(--accent-2), var(--accent-strong));
  box-shadow: 0 12px 28px -10px var(--accent-ring), inset 0 1px 0 rgba(255,255,255,.35);
  padding: 13px 18px; font-size: 1rem; margin-top: 22px;
}
.btn.primary:hover:not([disabled]) { transform: translateY(-1px); box-shadow: 0 18px 36px -10px var(--accent-ring), inset 0 1px 0 rgba(255,255,255,.4); }

.btn.ghost {
  background: var(--field-bg); border-color: var(--field-border); color: var(--text);
}
.btn.ghost:hover:not([disabled]) { border-color: var(--accent); color: var(--accent-strong); background: var(--accent-soft); }

.icon-btn {
  display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 12px;
  background: var(--field-bg); border: 1px solid var(--field-border); cursor: pointer;
  color: var(--text-soft); transition: var(--t);
}
.icon-btn:hover { color: var(--accent-strong); border-color: var(--accent); background: var(--accent-soft); }
.icon-btn.tiny { width: 28px; height: 28px; border-radius: 8px; }
.icon-btn.tiny .icon { width: 14px; height: 14px; }

/* theme toggle: show one icon at a time */
.theme-toggle .moon-icon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun-icon { display: none; }
:root[data-theme="dark"] .theme-toggle .moon-icon { display: block; }

/* focus visibility (keyboard) */
:where(a, button, input, select, summary, [tabindex]):focus-visible {
  outline: none; box-shadow: 0 0 0 3px var(--accent-ring); border-radius: 8px;
}
.dropzone:focus-visible, .transcript:focus-visible { box-shadow: 0 0 0 3px var(--accent-ring); }

/* ---- dropzone ------------------------------------------------------------- */
.dropzone {
  position: relative; border: 2px dashed var(--field-border); border-radius: var(--radius-sm);
  padding: 30px 20px; text-align: center; cursor: pointer; transition: var(--t);
  background: var(--inset-bg);
}
.dropzone:hover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone.dragover { border-color: var(--accent); background: var(--accent-soft); transform: scale(1.01); box-shadow: 0 0 0 4px var(--accent-ring); }
.drop-prompt { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.drop-icon {
  width: 56px; height: 56px; display: grid; place-items: center; border-radius: 50%;
  color: var(--accent-contrast); background: linear-gradient(135deg, var(--accent-2), var(--accent-strong));
  box-shadow: 0 10px 22px -8px var(--accent-ring); margin-bottom: 4px;
  animation: bob 2.4s ease-in-out infinite alternate;
}
.drop-icon .icon { width: 24px; height: 24px; }
@keyframes bob { from { transform: translateY(0); } to { transform: translateY(-7px); } }
.drop-title { font-weight: 600; font-size: 1rem; }

.file-chip {
  display: flex; align-items: center; gap: 12px; text-align: left;
  background: var(--field-bg); border: 1px solid var(--field-border); border-radius: var(--radius-xs);
  padding: 12px 14px;
}
.file-chip .icon { width: 22px; height: 22px; }
.file-meta { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.file-name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.field-error {
  display: flex; align-items: center; gap: 8px; margin-top: 10px;
  color: var(--danger); background: var(--danger-soft); border-radius: var(--radius-xs);
  padding: 8px 12px; font-size: 0.84rem; font-weight: 500;
}

/* ---- form fields / selects ----------------------------------------------- */
.options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 20px; }
@media (max-width: 560px) { .options-grid { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 7px; }
.field:first-child { grid-column: 1 / -1; } /* language spans the row */
.select-wrap { position: relative; display: block; }
.select-wrap .chevron {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  pointer-events: none; color: var(--text-faint); width: 16px; height: 16px;
}
.select {
  width: 100%; appearance: none; -webkit-appearance: none;
  padding: 11px 38px 11px 13px; border-radius: var(--radius-xs);
  background: var(--field-bg); border: 1px solid var(--field-border); color: var(--text);
  font-size: 0.92rem; cursor: pointer; transition: var(--t);
}
.select:hover { border-color: var(--accent); }
.select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-ring); }
.select option { color: #102a36; } /* legible in OS dropdown on all platforms */

/* ---- switch --------------------------------------------------------------- */
.switch-row { display: flex; align-items: flex-start; gap: 13px; margin-top: 18px; }
.switch { position: relative; flex: none; display: inline-block; width: 44px; height: 26px; cursor: pointer; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.track {
  position: absolute; inset: 0; border-radius: 999px; background: var(--track-off);
  transition: background var(--t); display: block;
}
.thumb {
  position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%;
  background: #fff; box-shadow: 0 2px 6px rgba(0,0,0,.25); transition: transform var(--t);
}
.switch input:checked + .track { background: linear-gradient(135deg, var(--accent-2), var(--accent-strong)); }
.switch input:checked + .track .thumb { transform: translateX(18px); }
.switch input:focus-visible + .track { box-shadow: 0 0 0 3px var(--accent-ring); }
.switch-label { display: flex; flex-direction: column; gap: 2px; padding-top: 1px; }

/* ---- advanced disclosure -------------------------------------------------- */
.advanced { margin-top: 18px; border-top: 1px solid var(--inset-border); padding-top: 14px; }
.advanced > summary {
  display: flex; align-items: center; gap: 8px; font-size: 0.88rem; font-weight: 600; color: var(--text-soft);
  list-style: none; user-select: none;
}
.advanced > summary::-webkit-details-marker { display: none; }
.advanced > summary .icon { width: 15px; height: 15px; transition: transform var(--t); }
.advanced[open] > summary .icon { transform: rotate(90deg); }
.advanced[open] > summary { color: var(--text); }
.advanced-body { padding-top: 4px; }
.advanced-body .switch-row:first-child { margin-top: 14px; }

/* ---- progress ------------------------------------------------------------- */
.progress { margin-top: 16px; }
.progress-bar {
  height: 10px; border-radius: 999px; background: var(--inset-bg);
  border: 1px solid var(--inset-border); overflow: hidden;
}
.progress-fill {
  display: block; height: 100%; width: 0%; border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-2), var(--accent-strong));
  transition: width var(--t);
  position: relative;
}
.progress-fill::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, transparent 20%, rgba(255,255,255,.5) 50%, transparent 80%);
  background-size: 200% 100%; animation: shimmer 1.3s linear infinite;
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
.progress.is-done .progress-fill { background: linear-gradient(90deg, var(--ok), var(--ok)); }
.progress.is-done .progress-fill::after { display: none; }
.progress.is-error .progress-fill { background: linear-gradient(90deg, var(--danger), var(--danger)); }
.progress.is-error .progress-fill::after { display: none; }
.progress-meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 8px; }
.progress-numbers { display: flex; align-items: baseline; gap: 10px; }
.pct { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 0.92rem; color: var(--accent-strong); }

/* ---- result --------------------------------------------------------------- */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  text-align: center; padding: 46px 16px; color: var(--text-soft);
}
.empty-icon {
  width: 64px; height: 64px; display: grid; place-items: center; border-radius: 50%;
  background: var(--inset-bg); border: 1px solid var(--inset-border); color: var(--accent);
  animation: pulse 2.6s ease-in-out infinite;
}
.empty-icon .icon { width: 28px; height: 28px; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .55; } }
.empty-state p:first-of-type { font-weight: 600; color: var(--text); }

.result-body { display: flex; flex-direction: column; gap: 16px; }
.result-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .result-stats { grid-template-columns: 1fr; } }
.stat {
  display: flex; flex-direction: column; gap: 5px;
  background: var(--inset-bg); border: 1px solid var(--inset-border); border-radius: var(--radius-xs); padding: 12px 14px;
}
.stat-main { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.stat-main .icon { width: 16px; height: 16px; color: var(--accent); }

.badge {
  font-size: 0.74rem; font-weight: 700; letter-spacing: .02em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-strong);
}
.badge.solid { background: linear-gradient(135deg, var(--accent-2), var(--accent-strong)); color: var(--accent-contrast); }
.badge.ghost { background: transparent; border: 1px solid var(--inset-border); color: var(--text-soft); }

.result-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.toolbar-actions { display: flex; gap: 8px; }

.transcript {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.83rem; line-height: 1.6; white-space: pre-wrap; word-break: break-word;
  background: var(--inset-bg); border: 1px solid var(--inset-border); border-radius: var(--radius-sm);
  padding: 14px 16px; max-height: 360px; overflow: auto;
}
.transcript::-webkit-scrollbar { width: 10px; height: 10px; }
.transcript::-webkit-scrollbar-thumb { background: var(--track-off); border-radius: 999px; border: 2px solid transparent; background-clip: content-box; }
.transcript .ts { color: var(--accent-strong); font-weight: 500; }

.result-error {
  display: flex; align-items: flex-start; gap: 12px; padding: 16px;
  background: var(--danger-soft); border: 1px solid var(--danger); border-radius: var(--radius-sm); color: var(--text);
}
.result-error .icon { color: var(--danger); width: 22px; height: 22px; flex: none; margin-top: 1px; }

/* ---- spinner -------------------------------------------------------------- */
.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2.5px solid color-mix(in srgb, var(--accent-contrast) 35%, transparent);
  border-top-color: var(--accent-contrast); animation: spin .7s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- device badge --------------------------------------------------------- */
.device-badge {
  font-size: 0.72rem; font-weight: 700; letter-spacing: .06em;
  padding: 3px 10px; border-radius: 999px; text-transform: uppercase;
  transition: background var(--t), color var(--t);
  flex: none;
}
.device-badge.cpu {
  background: var(--inset-bg); border: 1px solid var(--inset-border); color: var(--text-soft);
}
.device-badge.gpu {
  background: linear-gradient(135deg, #22c55e, #16a34a); color: #fff;
  box-shadow: 0 4px 12px -4px rgba(22, 163, 74, 0.5);
}

/* ---- footer --------------------------------------------------------------- */
.footer {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px;
  margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--inset-border);
  font-size: 0.82rem; color: var(--text-soft);
}
.footer a { color: var(--accent-strong); text-decoration: none; font-weight: 600; }
.footer a:hover { text-decoration: underline; }
.footer .dot { opacity: .5; }

/* ---- responsive ----------------------------------------------------------- */
@media (max-width: 600px) {
  .page { padding: 20px 16px 32px; }
  .card { padding: 20px; }
  .brand-tag { display: none; }
  .brand-mark { width: 40px; height: 40px; }
}

/* ---- motion-reduced ------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .aurora-blob { animation: none; }
  .progress-fill::after { display: none; }
}